<template>
	<view>
		<!-- 搜索组件 -->
		<!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> -->
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item, i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', active === i ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
				</block>
				
			</scroll-view>
			<!-- 右侧的滑动区 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">
						/ {{item2.cat_name}} /
					</view>
					<!-- 动态渲染三级分类 -->
					<view class="cate-lv3-list">
						<!-- 三级item -->
						<view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon" mode=""></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				// 当前设备可用的值
				wh: 0,
				cateList: [],
				active: 0,
				// 二级分类列表数据
				cateLevel2: [],
				// 滚动条距顶部的距离
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const {data: res} = await uni.$http.get("/api/public/v1/categories")
				if(res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				
				// 为二级分类赋值
				this.cateLevel2 = res.message[0].children
			},
			activeChange(i) {
				this.active = i;
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop = this.scrollTop ? 0 : 1
			},
			// 跳转到商品列表页
			gotoGoodsList(item) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			gotoSearch() {
				uni.navigateTo({
					url: "/subpkg/search/search"
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;
	.left-scroll-view {
		width: 120px;
		.left-scroll-view-item {
			background-color: #F7F7F7;
			line-height: 60px;
			font-size: 12px;
			text-align: center;
		  &.active {
				background-color: #FFFFFF;
				position: relative;
				&::before {
					content: " ";
					display: block;
					width: 3px;
					height: 30px;
					background-color: #C00000;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
	.right-scroll-view {
		
		.cate-lv2-title {
			font-size: 12px;
			text-align: center;
			font-weight: bold;
			padding: 15px 0;
		}
		
		.cate-lv3-list {
			display: flex;
			flex-wrap: wrap;
			
			.cate-lv3-item {
				width: 33.33%;
				display: flex;
				flex-direction: column;
				justify-content: center;
				align-items: center;
				margin-bottom: 10px;
				
				image {
					width: 60px;
					height: 60px;
				}
				
				text {
					font-size: 12px;
				}
			}
		}
	}
}
</style>
